T cells and the loss of immunologic tolerance in Sjögren's syndrome and systemic lupus erythematosus.

T cells and the loss of immunologic tolerance in Sjögren's syndrome and systemic lupus erythematosus.
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T 细胞与干燥综合征和系统性红斑狼疮中免疫耐受的丧失。

DOI:
10.1002/art.22984
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发表时间:
2007
影响因子:
--
通讯作者:
Hoffman,RobertW
Hoffman,RobertW
中科院分区:
--
文献类型:
--
作者:
Hoffman,RobertW

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In this issue of Arthritis & Rheumatism, Dudek et al (1) report the identification of T cell epitopes on the La/SSB autoantigen that are recognized in humanized transgenic mice expressing the HLA class II molecule DR3 (DRA1/DRB1* 0301) and its linked HLA–DQ counterpart (DQA1/DQB1* 0201). This study represents a major step in advancing our understanding of the process involved in the loss of immunologic tolerance to self antigens and the pathogenetic mechanisms of disease induction in systemic autoimmunity, particularly as these relate to the autoimmune response to the La/SSB autoantigen in Sjögren’s syndrome (SS) and systemic lupus erythematosus (SLE). Autoantibodies are widely recognized as a hallmark of the rheumatic diseases, and the presence of anti-La/SSB autoantibodies is a marker for SS (2–5). Less frequently, the presence of anti-La/SSB is a marker for SLE (1–5). Despite recognition of their association with SS and SLE, and despite previous studies of the evolution of autoantibody production against La/SSB (and the closely related autoantibody response to the Ro/SSA autoantigen), our understanding of the precise genesis of anti-La/SSB autoantibodies remains incomplete.In addition to the production of autoantibodies, B cells can have additional roles in pathogenesis, including the ability to serve as antigen-presenting cells (APCs), which allows them to process and present antigens as well as provide costimulatory signals to T cells; the ability to secrete pathologic cytokines, such as
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